# Redmine - project management software
# Copyright (C) 2006-2013  Jean-Philippe Lang
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

module Redmine #:nodoc:
  module CoreExtensions #:nodoc:
    module Date #:nodoc:
      # Custom date calculations
      module Calculations
        # Returns difference with specified date in months
        def months_ago(date = self.class.today)
          (date.year - self.year)*12 + (date.month - self.month)
        end

        # Returns difference with specified date in weeks
        def weeks_ago(date = self.class.today)
          (date.year - self.year)*52 + (date.cweek - self.cweek)
        end
      end
    end
  end
end
